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The reproductive structures of Gracilaria foliifera (Forsk.) Børg. from England and an unnamed species of Gracilaria from Nova Scotia were studied by light microscopy. These two entities are distinguishable on the basis of the type of gonimoblast tissue in their mature cystocarps. This, together with other evidence, suggests that these are separate taxa.
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Edelstein et al. (1978) studied this question.
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